MAX3389ECUG+T

Overview

The MAX3389ECUG+T is a 2.5V-powered RS-232 transceiver featuring three transmitters and two receivers in a 24-pin TSSOP package. It supports data rates up to 460kbps with ±15kV ESD protection on all I/O pins. The device operates from a +2.35V to +3.0V supply, drawing 300µA during active mode and 1µA in shutdown. A dedicated VL pin enables compatibility with mixed-voltage logic systems down to 1.8V. An internal 62Ω power switch and active LIN/LOUT handshaking I/O during shutdown are included.

Feature Summary

• Integrated dual charge pump generates required RS-232 voltages using only four small capacitors
• Dedicated logic-level I/O for hot-sync applications remains active during shutdown
• Internal power switch allows control of external circuitry or modules
• VL pin enables flexible interfacing with mixed-voltage logic systems

Applications

• Subnotebook and palmtop computers
• PDAs and PDA cradles
• Cell phone data cables
• Battery-powered equipment and handheld devices

Procurement Notes

Verify the ordering suffix 'C' indicates commercial temperature range (0°C to +70°C) and 'U' denotes the TSSOP package. Confirm '+T' specifies tape-and-reel packaging. Cross-reference the specific revision against the official datasheet to ensure component compatibility.

Selection Notes

Select this model when a third transmitter is required for ring indicator signals in PDA docking scenarios. Ensure the system voltage falls within the +2.35V to +3.0V range. Verify that the commercial temperature range meets environmental requirements, as industrial variants exist.

Part Context

This component belongs to the MAX3388E/MAX3389E family of low-power RS-232 transceivers designed specifically for portable electronics. It shares core architecture with the MAX3388E but adds active logic I/O during shutdown. The part integrates necessary charge pumps to eliminate external high-voltage generation components.

Replacement Considerations

MAX3388EEUG+ serves as a functional substitute if the additional shutdown-active logic I/O is not required. Verify package dimensions and pinout compatibility before substitution.